Everyone Loves A Underdog

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How come in movies like The Hobbit: The Battle of The Five Armies the bad guys army is so much bigger than the good guys? It seems almost cliche to me. The Orcs in this movie outnumber everyone 2 or 3 to 1 and it doesn’t seem fair. As my wife observes everyone loves a underdog. However in these movies the underdog has to fight twice as hard and there isn’t always a happy ending.